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Li, M; Li, N; Wang, S; Zhou, LJ; Li, M (reprint author), Sun Yat Sen Univ, Sch Astron & Space Sci, Guangzhou 510275, Guangdong, Peoples R China.
More evidence for the red-shift dependence of colour from the Joint Light-curve Analysis supernova sample using red-shift tomography
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Language英语
KeywordSupernovae General Cosmological Parameters Cosmology: Observations Dark Energy
AbstractIn this work, by applying the red-shift tomography method to the Joint Light-curve Analysis (JLA) supernova sample, we explore the possible red-shift dependence of the stretch luminosity alpha and the colour luminosity beta. The basic idea is to divide the JLA sample into different red-shift bins, assuming that alpha and beta are piecewise constants. Then, by constraining the I > CDM model, we check the consistency of the cosmology-fitting results given by the supernova sample of each red-shift bin. We also adopt the same technique to explore the possible evolution of beta in various subsamples of JLA. Using the full JLA data, we find that alpha is always consistent with a constant value. In contrast, at high red shift, beta has a significant trend of decreasing, at similar to 3.5 sigma confidence level (CL). Moreover, we find that the low-z subsample favours a constant beta; in contrast, the Sloan Digital Sky Survey and Supernova Legacy Survey subsamples favour a decreasing beta at 2 sigma and 3.3 sigma CL, respectively. Besides, by using a binned parametrization of beta, we study the impact of the evolution of beta on parameter estimation. We find that compared with a constant beta, a varying beta yields a larger best-fitting value of fractional matter density Omega(m0), which slightly deviates from the best-fitting result given by other cosmological observations. However, for both the varying beta and the constant beta cases, the 1 sigma regions of Omega(m0) are still consistent with the result given by other observations.
2016
Volume460Issue:3Pages:2586-2592
Subject AreaAstronomy & Astrophysics
DOIhttp://dx.doi.org/10.1093/mnras/stw1063
Indexed BySCI
Funding OrganizationNational Natural Science Foundation of China [11275247, 11335012, 11405024] ; National Natural Science Foundation of China [11275247, 11335012, 11405024] ; National Natural Science Foundation of China [11275247, 11335012, 11405024] ; National Natural Science Foundation of China [11275247, 11335012, 11405024] ; Sun Yat-Sen University [985] ; Sun Yat-Sen University [985] ; Sun Yat-Sen University [985] ; Sun Yat-Sen University [985] ; Fundamental Research Funds for the Central Universities [16lgpy50] ; Fundamental Research Funds for the Central Universities [16lgpy50] ; Fundamental Research Funds for the Central Universities [16lgpy50] ; Fundamental Research Funds for the Central Universities [16lgpy50]
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Document Type期刊论文
Identifierhttp://ir.itp.ac.cn/handle/311006/21560
Collection理论物理所科研产出_SCI论文
Corresponding AuthorLi, M (reprint author), Sun Yat Sen Univ, Sch Astron & Space Sci, Guangzhou 510275, Guangdong, Peoples R China.
Recommended Citation
GB/T 7714
Li, M,Li, N,Wang, S,et al. More evidence for the red-shift dependence of colour from the Joint Light-curve Analysis supernova sample using red-shift tomography[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2016,460(3):2586-2592.
APA Li, M,Li, N,Wang, S,Zhou, LJ,&Li, M .(2016).More evidence for the red-shift dependence of colour from the Joint Light-curve Analysis supernova sample using red-shift tomography.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,460(3),2586-2592.
MLA Li, M,et al."More evidence for the red-shift dependence of colour from the Joint Light-curve Analysis supernova sample using red-shift tomography".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 460.3(2016):2586-2592.
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